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A053496 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 18
5 66
6 396
7 2052
8 12636
9 91548
10 625176
11 4673736
12 43575192
13 377205336
14 3624289488
15 38829340656
16 397695226896
17 4338579616272
18 54018173703456
19 641634784488288
20 8208962893594656
21 113809776294348576
22 1526808627197721792
23 21533423236302943296

[1,1,2,6,18,66,396,2052,12636,91548,625176,
 4673736,43575192,377205336,3624289488,38829340656,
 397695226896,4338579616272,54018173703456,
 641634784488288,8208962893594656,
 113809776294348576,1526808627197721792,
 21533423236302943296]

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Last modified November 15 11:18 EST 2019. Contains 329144 sequences. (Running on oeis4.)